The Huế chemical attacks Attack occurred Presence on 3 June 1963 , when soldiers of the Army of the Republic of Vietnam ( ARVN ) poured Motion liquid chemicals from tear gas grenades onto the heads of praying Rite Buddhists in Huế , South Vietnam .

Four drugs factories were captured Conquering along with gallons of chemicals used to process Self_motion opium into heroin .

Helmets impregnated with chemicals to neutralise Cure chlorine had been issued Supply in several variants , each more effective than the last .

Inside one of the undetonated suitcases , a digital timer encased Preserving in transparent plastic was packed Placing alongside a dozen plastic bottles containing fuel oils and chemicals .